php-doc-en/reference/array/functions/array-splice.xml

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<refentry xml:id="function.array-splice" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>array_splice</refname>
  <refpurpose>Remove a portion of the array and replace it with something else</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>array</type><methodname>array_splice</methodname>
   <methodparam><type>array</type><parameter role="reference">input</parameter></methodparam>
   <methodparam><type>int</type><parameter>offset</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>length</parameter><initializer>0</initializer></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>replacement</parameter></methodparam>
  </methodsynopsis>
  <para>
   Removes the elements designated by <parameter>offset</parameter> and
   <parameter>length</parameter> from the <parameter>input</parameter> array,
   and replaces them with the elements of the
   <parameter>replacement</parameter> array, if supplied.
  </para>
  <para>
   Note that numeric keys in <parameter>input</parameter> are not preserved.
  </para>
  <note>
   <simpara>
    If <parameter>replacement</parameter> is not an array, it will be
    <link linkend="language.types.array.casting">typecast</link>
    to one (i.e. <code>(array) $parameter</code>). This may result in unexpected
    behavior when using an object or &null; <parameter>replacement</parameter>.
   </simpara>
  </note>
 </refsect1>
  <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>input</parameter></term>
     <listitem>
      <para>
       The input array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>offset</parameter></term>
     <listitem>
      <para>
       If <parameter>offset</parameter> is positive then the start of removed
       portion is at that offset from the beginning of the
       <parameter>input</parameter> array.  If <parameter>offset</parameter>
       is negative then it starts that far from the end of the
       <parameter>input</parameter> array.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       If <parameter>length</parameter> is omitted, removes everything
       from <parameter>offset</parameter> to the end of the array.  If
       <parameter>length</parameter> is specified and is positive, then
       that many elements will be removed. If
       <parameter>length</parameter> is specified and is negative then
       the end of the removed portion will be that many elements from
       the end of the array.  Tip: to remove everything from
       <parameter>offset</parameter> to the end of the array when
       <parameter>replacement</parameter> is also specified, use
       <literal>count($input)</literal> for
       <parameter>length</parameter>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>replacement</parameter></term>
     <listitem>
      <para>
       If <parameter>replacement</parameter> array is specified, then the
       removed elements are replaced with elements from this array.
      </para>
      <para>
       If <parameter>offset</parameter> and <parameter>length</parameter>
       are such that nothing is removed, then the elements from the
       <parameter>replacement</parameter> array are inserted in the place
       specified by the <parameter>offset</parameter>. Note that keys in
       replacement array are not preserved.
      </para>
      <para>
       If <parameter>replacement</parameter> is just one element it is
       not necessary to put <literal>array()</literal>
       around it, unless the element is an array itself, an object or &null;.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the array consisting of the extracted elements.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>array_splice</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php
$input = array("red", "green", "blue", "yellow");
array_splice($input, 2);
// $input is now array("red", "green")

$input = array("red", "green", "blue", "yellow");
array_splice($input, 1, -1);
// $input is now array("red", "yellow")

$input = array("red", "green", "blue", "yellow");
array_splice($input, 1, count($input), "orange");
// $input is now array("red", "orange")

$input = array("red", "green", "blue", "yellow");
array_splice($input, -1, 1, array("black", "maroon"));
// $input is now array("red", "green",
//          "blue", "black", "maroon")

$input = array("red", "green", "blue", "yellow");
array_splice($input, 3, 0, "purple");
// $input is now array("red", "green",
//          "blue", "purple", "yellow");
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   <example>
    <title><function>array_splice</function> examples</title>
    <para>
     The following statements change the values of <varname>$input</varname>
     the same way:
    </para>
    <programlisting role="php">
<![CDATA[
<?php
array_push($input, $x, $y);
array_splice($input, count($input), 0, array($x, $y));
array_pop($input);
array_splice($input, -1);
array_shift($input);
array_splice($input, 0, 1);
array_unshift($input, $x, $y);
array_splice($input, 0, 0, array($x, $y));
$input[$x] = $y; // for arrays where key equals offset
array_splice($input, $x, 1, $y);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>array_slice</function></member>
    <member><function>unset</function></member>
    <member><function>array_merge</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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